Relapsing

Relapsing causes poisons to rebound and re-afflict 1-10 seconds after the initial affliction. Only poisons which land after the target has relapsing will create a rebounding timer. Multiple timers can exist at once. The rebound timer will fail if the target doesn't have relapsing when it finishes. The rebound is subject to poison shrugging.

In a test with 35 poisons the minimum time to a rebound was 1s and the maximum time was 10s. The average time was 5.5s supporting the idea that it's 1-10s random.